I forgot another important category of Junk Pirate donation treasure... weapons! Be it BB guns, machetes, switchblades, ninja stars, bullets, pepper spray, or just a good old fashioned broadsword, weapons always make good donations. You can never have too many instruments of death around in a pinch. Hell, even toys weapons are pretty cool, especially the old kind of water pistols that look pretty real before the law was passed that made them all have neon colors. Here is a picture from the old Junk Pirate archives of one of the many incarnations of the Junk Store Arsenal:
While this donation isn't exactly a weapon, it still qualifies as far as I'm concerned. An authentic wooden ammo-box that housed a World War One missile. Ka-boom!